For emergency assistance, please call +44 (0)1494 429800

On-Site Crankshaft Journal Repair

On-Site & In-Situ Crankshaft Journal Repair

The main journal forms the rotational centre of a crankshaft. Grinding or machining and polishing of crankshaft main journals is one of our specialities.

We guarantee our repairs to OEM (original equipment manufacturer) tolerances and surface finish specifications.

The only limit to the diameter catered for is the physical space available within the engine to mount our equipment.

For this sort of work, the crankshaft has to be rotated. We usually achieve this with the engine barring gear.

Due to restricted access on smaller engines, this sort of work tends to be performed on main engines. Typically B&W, MAN, Mirrlees, Pielstick, Sulzer, and Wartsila.

We Can Repair Your Crankshaft Journal On-Site

From our base in the UK, our highly trained engineers travel worldwide, making precision on-site repairs to large diesel engine crankshafts and crankpins. With our patented, portable equipment, our technicians come to you to get your engine up and running fast. 

We are the UK’s foremost crankshaft repair experts with 70 years of in-situ experience.

We Are The Original On-Site Repair Company

Originally founded in 1952, Nicol & Andrew was the first company of its kind in the world to carry out in-situ machining and repairs on marine propulsion units.

We invented the tools to do the job on-site. Our orbital tooling system revolutionised the repair of crankshafts whilst still fitted in the engine. The system rotates around the damaged crankpin, so there is no need to remove or rotate the crankshaft.

A huge benefit is the reduction of downtime suffered by clients with crankshaft (crankpin and main journal) failures. A repair can be completed in just two or three days in many cases.

Need Help Now?

For emergency assistance, please call +44 (0)1494 429800

Further Information?

Find out more about our on-site crankshaft machining services

Main Bearing Journal and Crankpin Repairs

Our range of specialist tooling has been specially designed to fit almost all types of engine. Sizes catered for range from small generator crankshafts right up to the larger main engine types. We cover standard journal diameters from 75mm up to 1000mm, and over if necessary.

Why Choose Nicol & Andrew for On-Site Crankshaft Machining?


We Cut Your Downtime

Our orbital repair process means we bring the repair workshop to you. For some repairs, we can get you back running in as little as 12 hours.


We Save You Money

Your equipment does not have to be stripped down and transported or re-assembled. The savings on this alone are very significant.


All Major Industries Served

We are a world leader in in-situ repair technology and on-site repair services. Our worldwide customer base covers the manufacturing, marine power, petrochemical, paper, process, oil and gas industries.

Machining to OEM Tolerances

Our in-house trained crankshaft technicians can carry out in-situ machining and polishing of crankshaft crankpins and journals to OEM tolerances and surface finish specifications.

Nicol & Andrew have performed this type of in-situ machining repair many hundreds of times over the years and so can guarantee total customer satisfaction.

What if I have a severely damaged crankpin, including the radius?

Our orbital system uses the radii as a datum. So you might think it is a problem if the bearing has swaged out under heat and damaged the radius.

In most cases, this is not a problem, with our proven ability to re-machine most damaged radii in alignment with the original shaft centreline.

Benefits at a glance

  • Fast response (often same or next day)
  • Downtime reduced (as little as 24 hours)
  • Always available, 24/7 service
  • No need to strip the engine
  • Restored to original OEM specification
  • Guaranteed and verifiable results
  • Comprehensive technical backup

What Our Clients Say

Very pleased with the speed and standard of repair to our diesel engine. Please thank your technicians for going the extra mile to ensure it was finished on time.


Another first class repair from your technicians. Please thank them for a timely repair and for working so hard under difficult conditions. Our engine is back up and running with no problems.


A Bad In-Situ Repair Could Scrap a £500,000 Crankshaft

If you need a fast response, worldwide, from an expert team with over 65 years’ of in-situ crankpin machining experience, call us now on +44 1494 429800.